Type: SystemInt32The leading dimension of the array
a. Must be greater than or
equal to Max(1,m).

ipiv

Type: SystemInt32Integer array of length
min(m,n) that
will hold the pivot indexes. Row i of the
matrix was interchanged with row
ipiv[i].

info

Type: SystemInt32Reference to an integer containing a
result code. Zero indicates success. Greater than zero
indicates U(i,i) is exactly zero. The decomposition
has been completed, but the factor U is exactly
singular, and division by zero will occur if it is used
to solve a system of equations.